used to use a genie then i switched to the arcteryx khamsin 30 (employee discount helped) and when my 30 was stolen i went with the 38 instead.... i still think the 30 is the best... if you take out the back panel it folds up as small as the genie, weighs a little bit more but is way, way more comfortable and carries much better.
i think it's discontinued though. RIP khamsin 30